Reply to RD Jindal

RD-flatness and RD-injectivity

It is proved that every commutative ring whose RD-injective modules are Σ-RD-injective is the product of a pure semi-simple ring and a finite ring. A complete characterization of commutative rings for which each artinian (respectively simple) module is RD-injective, is given. These results can be obtained by using the properties of RD-flat modules and RD-coflat modules which are respectively th...

Solutions to the 63 rd

A3 Note that each of the sets {1}, {2}, . . . , {n} has the desired property. Moreover, for each set S with integer average m that does not contain m, S ∪ {m} also has average m, while for each set T of more than one element with integer average m that contains m, T \{m} also has average m. Thus the subsets other than {1}, {2}, . . . , {n} can be grouped in pairs, so Tn −n is even. A4 (partly d...

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Reply to the Letter to the Editor Reply to

We thank Dr Schachner for his interest and comments on our recent experimental findings [1]. The first facet of our study was that although initially (at 1 month), neointima formation in vein grafts was inhibited by perivenous application of fibrin glue at the time of implantation, at 4 months neointimal formation was not significantly different from controls [1]. Dr Schachner has implied that ...